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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba78d3a46578e9caa145949177137c422537c83662cc5913b756987d85eb134' 
  AND token = 'ZkDTK1MyCabx5bG1r9VTXLzqKmD7gIJErXwFWkQQBC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}